Hull Model Interface for the CFD Software MICHLET 9.33

[bingli]

This article demonstrates a simple process for generating hull models for MICHLET 9.33 in Spline Formats, and using Python to extract and display wave pattern plots.

• 1, Below is our software model:

• 2, Below is the MICHLET 9.33 hull model:

• 3, Below is the wave pattern plot:

• 4, Below is the resistance curve plot:

Remarks：

The MICHLET software provides a fast method for estimating wave resistance. It only requires sectional shape data to perform CFD calculations, without the need for time-consuming CFD modeling. When combined with our modern hull form modification and design software, it is particularly well-suited for early-stage hull optimization.

However, one aspect I find questionable is that the software automatically adjusts the sectional shape values (e.g., waterline breadth) based on the specified displacement, length, and draft — resulting in a discrepancy between the input and the actual model used in the calculation. In addition, the software relies on keyboard shortcuts for operation, which is not very user-friendly.

If you're interested in this software, feel free to leave a comment and join the discussion.

 

[mc_rash]

Hi @bingli your hull look stretched because you included the offsets above the waterline. Remove those and you'll see everything is fine.

Btw, don't present Michlet as if it's your software or that others could think you are the developer which is @Leo Lauzauskas.

Kind regards

 

[bingli]

Hi @bingli your hull look stretched because you included the offsets above the waterline. Remove those and you'll see everything is fine.

Btw, don't present Michlet as if it's your software or that others could think you are the developer which is @Leo Lauzauskas.

Kind regards

Hi, thank you very much for your helpful comments!

I’ll review the draft and offset settings carefully — I appreciate your reminder. You're right that the appearance can vary depending on how the data is interpreted, though I believe Michlet does handle offsets above the waterline if configured correctly.

Also, just to clarify, I’m not the developer of Michlet — all credit goes to Dr. Leo Lazauskas. I simply created a small interface from our hull design tool to Michlet to assist in preliminary evaluations.

Thanks again for your insights!

Best regards,
Bing Li

 

[bingli]

This article demonstrates a simple process for generating hull models for MICHLET 9.33 in Spline Formats, and using Python to extract and display wave pattern plots.

• 1, Below is our software model:

View attachment 203562

• 2, Below is the MICHLET 9.33 hull model:

View attachment 203563

• 3, Below is the wave pattern plot:

View attachment 203564
View attachment 203565

• 4, Below is the resistance curve plot:

View attachment 203566

Remarks：

The MICHLET software provides a fast method for estimating wave resistance. It only requires sectional shape data to perform CFD calculations, without the need for time-consuming CFD modeling. When combined with our modern hull form modification and design software, it is particularly well-suited for early-stage hull optimization.

However, one aspect I find questionable is that the software automatically adjusts the sectional shape values (e.g., waterline breadth) based on the specified displacement, length, and draft — resulting in a discrepancy between the input and the actual model used in the calculation. In addition, the software relies on keyboard shortcuts for operation, which is not very user-friendly.

If you're interested in this software, feel free to leave a comment and join the discussion.

However, one aspect I find a bit puzzling is that the software seems to automatically adjust sectional shapes (e.g., waterline beam) to match the specified displacement, length, and draft — which can result in discrepancies between the input and the actual model used in the calculation. Is this expected behavior, or is there a way to preserve the exact input geometry?

I really appreciate the discussion.

 

[mc_rash]

Hi Bingli,
don't worry it was just a hint as it might appear to some readers as if you are the developer.

Michlet only needs to know the underwater portion of the hull, so I would assume the values length, beam etc. should be token only from the underwaterbody of the hull. When I made contact with Mitchlet for the first time I had the same issue, maybe I didn't read the manual well enough or it isn't clearly mentioned in it.